This part is a kind of semiconductor called 2SD1238.

Function of this product has Large Current Switching Applications.

Manufacturers : Sanyo

Image and pinout :

Some of the text within the PDF file :

Ordering number : ENN1429A 2SB922 / 2SD1238 PNP / NPN Epitaxial Planar Silicon Transistors 2SB922 / 2SD1238 Large Current Switching Applications Applications • Package Dimensions unit : mm 2022A [2SB922 / 2SD1238] 3.5 15.6 14.0 2.6 3.2 4.8 2.0 Large current switching of relay drivers, high-speed inverters, converters. Features • • 1.6 2.0 20.0 0.6 1.0 1 0.6 2 3 1.4 1.3 1.2 15.0 20.0 Low collector-to-emitter saturation voltage : VCE(sat)=-0.5V (PNP), 0.4V (NPN) max. Wide ASO and highly resistant to breakdown. 1 : Base 2 : Collector 3 : Emitter SANYO : TO-3PB 5.45 5.45 Specifications ( ) : 2SB922 Absolute Maximum Ratings at Ta=25°C Parameter Collector-to-Base Voltage Collector-to-Emitter Voltage Emitter-to-Base Voltage Collector Current Collect [ ... ]

2SD1238 PDF Datasheet Download